Apple 5S gives Apple 5S mobile phone. Why can't you send text messages? Anyone who sends it to others can send it Why can't I send it to one person separately?

Can send, just because a single person can't send:

1 It may be that the user entered the wrong number or the mobile phone number is missing a number, which will cause the wrong number to be missed by the other party.

If there is a problem with the setting of the other party's SMS center, you can call the other party to check and check with the number operator whether the number of the SMS center is correct.

3 or there is an error in the number stored by the user, the solution: delete the short message information to the regular mailbox, and then back up the short message. Delete all the numbers that can't be sent on the mobile phone and SIM card, and then set-Applications-Manage Applications-All Applications-SMS-Forced Stop-Clear Data.